get size M.. its a Chinese cut and it should fit you fine. you wont look like the Michelin Man. Quite stylish "Industrial" look to them. The knee armor is enough for basic street use but I don't use them, I use my Knox knee armor over them.. there is a pocket for the armor in each knee so you can put any pad you want in there.
when if first got them they were hot as hell but then I found a tag inside that said to wash several times before use. after that they ventilated pretty good, a tad less ventilation than jeans I would say.(about on par I guess) . with the liners inside they are very warm. Its a nice med thickness liner just like in my Icon contra jacket.
They are water resistant, in a very light rain, the water just kind of slides off of them in the slipstream.. in heavy rain you are going to get wet, but I discovered that if I "went commando" the pants can get damp but they feel dry to the touch.. your legs will get wet but as long as you have nothing underneath if feels nice and comfortable with no chafing,, wet in the wind they feel as warm as say an air-conditioned car, you don't "feel wet" but you are, you just get "cool" the mesh liner I think makes that effect... and you can walk around in them wet and it feels normal, they dry out pretty quickly too so it wasn't a big deal to me. I never wore the cold weather liner in the rain though so I cant give any details, but just off the top of my head I would say that with the cold weather liner in the rain you would be damp but warm... the liner feels pretty slick so I would think that it wouldn't chafe you up if you were to walk around in them.. One of the big things I like about these pants is that you can walk around in public with them and it looks cool, just a guy walking around in "cool motorcycle pants", no pre-bent knees or sliders... just cool looking gear. Protection is going to be basic slide protection and basic knee pads.. nothing real special there.. better then jeans though. A lot better I would say. Also the pockets are awesome, very useful... they also look like they can attach to your jacket with some loops but I haven't used that feature yet so don't take that to the bank.. overall a useful piece of gear that provides basic protection and style that exceeds the asking price. In person, they look like 150-175 dollar pair of pants. It actually looks like something made by Icon.. I put it next to my Jacket and they look like a set...about the same quality.